docs: def update_now_playing(
          self,
          artist,
          title,
          album=None,
          album_artist=None,
          duration=None,
          track_number=None,
          mbid=None,
          context=None,
      ):
          """
          Used to notify Last.fm that a user has started listening to a track.
  
              Parameters:
                  artist (Required) : The artist name
                  title (Required) : The track title
                  album (Optional) : The album name.
                  album_artist (Optional) : The album artist - if this differs
                      from the track artist.
                  duration (Optional) : The length of the track in seconds.
                  track_number (Optional) : The track number of the track on the
                      album.
                  mbid (Optional) : The MusicBrainz Track ID.
                  context (Optional) : Sub-client version
                      (not public, only enabled for certain API keys)
          """
  
          params = {"track": title, "artist": artist}
  
          if album:
              params["album"] = album
          if album_artist:
              params["albumArtist"] = album_artist
          if context:
              params["context"] = context
          if track_number:
              params["trackNumber"] = track_number
          if mbid:
              params["mbid"] = mbid
          if duration:
              params["duration"] = duration
  
          _Request(self, "track.updateNowPlaying", params).execute()